Senior Software Engineer, Networking

Ditto is redefining how data moves at the edge. Our mission is to make it seamless for developers to build resilient, real-time applications, regardless of network conditions. Whether you're in a stadium, airplane, or remote military base, Ditto's peer-to-peer sync engine ensures devices stay connected and data stays consistent, even without internet. With more than $145 million in funding and trusted by organizations like Chick fil A, Delta Airlines and the U.S. military, Ditto powers mission critical experiences across aviation, retail, travel, hospitality, defense and more. As a globally distributed, fast growing startup, we're committed to building a diverse and inclusive team that reflects the wide range of perspectives needed to solve the world's hardest connectivity problems.

Ready to shape the future of mesh networking? Join a team at the forefront of next generation network technology at Ditto. We're expanding our core network stack and building high performance solutions in next generation networking, including routing protocols, end to end connectivity, transport mechanisms and edge platforms for mesh systems. Work remotely, set your own schedule and solve complex, meaningful problems. We are proud to be an equal opportunity employer with a diverse, global team. We believe that inclusive teams drive innovation and are committed to fostering a workplace that values a wide range of backgrounds, perspectives and talents.

• Design, implement and own core components of Ditto's networking and transport stack, spanning overlay networking (routing, virtual connections, channel lifecycle) and underlying physical transports and protocols (BLE, LAN, Wi Fi Aware, AWDL, etc.)
• Drive the re architecture of the networking stack toward a more modular, scalable and high performance design, establishing clear interfaces and ownership boundaries between transport layers and mesh abstractions
• Debug and systematically improve real world connectivity issues including data transfer reliability, MTU negotiation, pairing instability, throughput ceilings and cross platform data sync behaviour
• Build and optimise transport mechanisms with explicit attention to flow control, backpressure, congestion handling, retries, connection lifecycle management and failure recovery
• Identify and eliminate performance bottlenecks across latency, memory footprint, CPU utilisation and tail behaviour in highly concurrent, asynchronous systems
• Design protocol state machines, wire formats and transport abstractions that remain correct under unreliable networks, intermittent connectivity and constrained environments
• Establish meaningful observability through targeted logging, metrics and diagnostics to enable rapid production debugging and root cause analysis

• 5+ years of professional experience building systems software, with at least 3 years focused on networking, transport protocols or routing
• Strong proficiency in Rust or C++, including ownership and borrowing semantics, async runtimes, concurrency primitives and profiling/optimisation techniques
• An understanding of key mesh networking topics such as TCP, UDP and QUIC semantics and trade offs, including connection establishment, congestion and flow control, retransmission behaviour, MTU/fragmentation and practical implications for latency, throughput and reliability in real world systems
• Exposure to or experience working with networked services and protocols; demonstrated ability to debug complex behaviour in networked and concurrent systems (race conditions, deadlocks, resource leaks, latency spikes)
• Experience designing modular APIs and abstractions that scale across multiple implementations and evolve safely over time
• Clear written and verbal communication skills in a distributed, asynchronous team environment
• A passion to learn new networking technologies, APIs and approaches to build at the bleeding edge of mesh networking

• Experience with mesh networking protocols, routing algorithms or gossip protocols
• Understanding of mobile platform constraints including background execution models, battery optimisation, OS suspension/resume cycles and their impact on persistent connections
• Experience with Apple Core Bluetooth or Android Wi Fi Aware APIs
• Experience with Linux networking, sockets, async I/O or low level systems programming
• Willingness to travel once per quarter for in person team gatherings

We offer competitive salaries and meaningful equity. We believe everyone on the team should have a stake in what we're building. Benefits vary by region to make sure you're covered in the ways that matter most. In the US, that includes health, dental, vision, life and disability insurance, plus a 401(k) and flexible spending accounts. In the UK, we offer private healthcare through Vitality, a pension plan and region specific coverage. For our team members elsewhere in the world, we work with our global employer platform to offer equitable benefits and coverage. Regardless of where you live, everyone at Ditto can utilise flexible time off. While we work remotely, our Atlanta and San Francisco offices are open if you ever want a place to work or meet up with teammates.

At Ditto, we know game changers don't always come wrapped in a "perfect" resume. Years of experience? Every single bullet point checked? Meh. That's not what drives us.

What does matter?

• Grit
• Curiosity
• Adaptability
• A genuine spark for what we're building

So if you're fired up about our mission but not sure you tick every box - hit that apply button anyway. Use your application to show us how you'll make an impact here. We're always on the lookout for exceptional humans who want to grow, stretch and build something meaningful with us.

Ditto is proud to be an equal opportunity employer. We do not discriminate in hiring or any employment decision based on race, color, religion, national origin, age, sex (including pregnancy, childbirth or related medical conditions), marital status, ancestry, physical or mental disability, genetic information, veteran status, gender identity or expression, sexual orientation or other applicable legally protected characteristics. Ditto is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If you need assistance or an accommodation due to a disability, please let us know.